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Borrowings (Details) (USD $)
0 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Mar. 08, 2012
StreetLinks LLC [Member]
Sep. 30, 2012
StreetLinks LLC [Member]
Sep. 30, 2012
StreetLinks LLC [Member]
March 8, 2012 [Member]
Sep. 30, 2012
StreetLinks LLC [Member]
June 30, 2012 [Member]
Sep. 30, 2012
StreetLinks LLC [Member]
September 30, 2012 [Member]
Sep. 30, 2012
StreetLinks LLC [Member]
Last Day of Each Quarter Until March 8, 2016 [Member]
Sep. 30, 2012
StreetLinks LLC [Member]
March 8, 2016 [Member]
Sep. 30, 2012
StreetLinks LLC [Member]
Unit Purchase Agreement [Member]
Sep. 30, 2012
Post-Modification Notes [Member]
Dec. 31, 2011
Post-Modification Notes [Member]
Mar. 22, 2011
Junior Subordinated Debt [Member]
Pre-Modification Notes [Member]
Sep. 30, 2012
Senior Notes [Member]
Mar. 22, 2011
Senior Notes [Member]
Post-Modification Notes [Member]
Mar. 22, 2011
Senior Notes [Member]
Post-Modification Notes [Member]
Interest Rate, Pre-Trigger [Member]
Mar. 22, 2011
Senior Notes [Member]
Post-Modification Notes [Member]
Modification Trigger, One [Member]
Mar. 22, 2011
Senior Notes [Member]
Post-Modification Notes [Member]
Interest Rate, Post-Trigger [Member]
Debt Instrument [Line Items]                                    
Face amount of debt                         $ 78,100,000   $ 85,900,000      
Senior notes 81,201,000 79,654,000                 81,200,000 79,700,000            
Debt instrument, covenant, tangible net worth, minimum                           40,000,000        
Debt instrument, covenant, interest coverage ratio, minimum                           1.35        
Debt instrument, covenant, leverage ratio, maximum                           95.00%        
Interest rate                               1.00%    
Proceeds                                 40,000,000  
Variable rate, description                                   three-month LIBOR
Variable rate                                   3.50%
Ownership percentage increase     5.00%                              
Purchase price         $ 500,000 $ 500,000 $ 300,000 $ 300,000 $ 1,600,000 $ 6,100,000                
Interest rate       4.00%